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INCOME TAXES (Deferred taxes) (Details) - ASC Topic 842, Leases - Adjustment $ in Millions | Mar. 31, 2019 USD ($)
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Deferred tax assets: |
Deferred tax assets | $ 19.0
Deferred tax liabilities | $ 19.0

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- Definition Deferred tax assets that are related to operating lease liabilities. + References No definition available. + Details
Name: | arcb_DeferredTaxAssetsOperatingLeaseLiabilities
Namespace Prefix: | arcb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Deferred tax liabilities that are related to operating lease right of use assets. + References No definition available. + Details
Name: | arcb_DeferredTaxLiabilitiesOperatingLeaseRightOfUseAssets
Namespace Prefix: | arcb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_DeferredTaxAssetsNetAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201602Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RestatementAxis=srt_RestatementAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |